A Flatpak bundle is a self-contained package format used for distributing applications on Linux. It includes the application itself, its dependencies, and runtime environment, all bundled together. This allows applications to run consistently across different Linux distributions, regardless of the underlying system libraries. Flatpak bundles are designed to address dependency hell and fragmentation issues in the Linux ecosystem. They promote application sandboxing, enhancing security by isolating applications from the host system and other applications. This isolation limits the potential damage from malicious or buggy applications. Flatpak also facilitates easier updates and management of applications, as updates are handled within the Flatpak environment. The format is designed to be portable and reproducible, ensuring that applications can be built and run consistently across different environments. Flatpak bundles are typically distributed through Flatpak repositories, which act as centralized sources for applications.